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ruby extract elements from array

Caffeinated Developer answered on May 18, 2022 Popularity 5/10 Helpfulness 1/10

answer ruby extract elements from array

related ruby take elements from array

ruby extract elements from array

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Suppose you have an array of hashes like this:

```ruby
arr = [{a: 1, b: 2}, {c: 3, d: 4}, {e: 5, f: 6}]
```

You can extract the values corresponding to a given key like this:

```ruby
arr.map { |h| h[:a] }
# => [1, nil, nil]
```

```ruby
arr.map { |h| h[:b] }
# => [2, nil, nil]
```

```ruby
arr.map { |h| h[:c] }
# => [nil, 3, nil]
```

```ruby
arr.map { |h| h[:d] }
# => [nil, 4, nil]
```

```ruby
arr.map { |h| h[:e] }
# => [nil, nil, 5]
```

```ruby
arr.map { |h| h[:f] }
# => [nil, nil, 6]
```

If you want to get all the values for all the keys, you can use `#values`:

```ruby
arr.map { |h| h.values }
# => [[1, 2], [3, 4], [5, 6]]
```

Popularity 5/10 Helpfulness 1/10 Language ruby

Source: Grepper

Tags: elements extract ruby

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Contributed on May 18 2022

Caffeinated Developer

0 Answers Avg Quality 2/10

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ruby take elements from array

Comment

end_index # => the end of index

There are 3 ways:
arr[0...end]
arr[0, end]
arr.first end

Popularity 4/10 Helpfulness 1/10 Language ruby

Source: Grepper

Tags: take elements ruby

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Contributed on Apr 02 2023

Comfortable Cheetah

0 Answers Avg Quality 2/10

ruby extract elements from array

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